19987077983 has 2 divisors, whose sum is σ = 19987077984. Its totient is φ = 19987077982.

The previous prime is 19987077977. The next prime is 19987078091. The reversal of 19987077983 is 38977078991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19987077983 - 2⁴ = 19987077967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19987077083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9993538991 + 9993538992.

It is an arithmetic number, because the mean of its divisors is an integer number (9993538992).

Almost surely, 2^19987077983 is an apocalyptic number.

19987077983 is a deficient number, since it is larger than the sum of its proper divisors (1).

19987077983 is an equidigital number, since it uses as much as digits as its factorization.

19987077983 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48009024, while the sum is 68.

The spelling of 19987077983 in words is "nineteen billion, nine hundred eighty-seven million, seventy-seven thousand, nine hundred eighty-three".